Pet step



FIG. 1 is a top, front, right perspective view of a pet step in accordance with my design;

FIG. 2 is a bottom, rear, right perspective view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a left side elevational view thereof; and,

FIG. 8 is a rear elevational view thereof.

The broken lines shown represent unclaimed features of the pet step and form no part of the claimed design. 

CLAIM The ornamental design for a pet step, as shown and described. 